GMC Hybrid 2006 Owner's Manual page 11

In the truck bed, they are located on the passenger side
near the tailgate.
The power outlets are not designed for equipment
with high initial peak starting power of greater than
2,400 watts, such as some air compressors,
table saws, etc.
Short Circuits, Overloads and Ground
Fault Detection (GFD)
The 120-volt AC power outlets are protected against
short circuits, overloads and ground faults. If the system
detects a short or overloaded circuit, it will immediately
shut down the outlets and the light next to the APO button
will flash, while at the same time a 120V OVERLOAD
message will appear in the Driver Information Center
(DIC). After the fault condition is corrected, the system
can be reset by pressing and releasing the APO button.
See "APO Operating Modes" for more information on the
APO button. Short circuits may occur because a defective
extension cord or defective electrical device is plugged
into an outlet.
Some electrical devices, such as motor-driven appliances
and tools, have high start-up currents. During this start-up
period, the 120-volt AC supply will attempt to start the
electrical device for up to 5 seconds. If the current does
not fall below the maximum 20 amp rating of the APO
within this 5-second timeframe, the system will shut down
the outlets and the light next to the APO button will flash,
while at the same time a 120V OVERLOAD message in
the DIC will appear. This type of situation is unlikely, but if
it does happen, press the APO button and try to start the
electrical device again. If the electrical device fails to start
a second time, it is probably because the device needs
more start-up power than is available.
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